[imp] Large attachment download problem

[Kevin Konowalec]

Horde: 3.1.2
Imp: H3 (4.1.2)
Turba: H3 (2.1.1)

PHP Version: 4.4.1
PHP Major Version: 4.4
PHP Minor Version: 1

in php.ini:

max_execution_time = 90     ; Maximum execution time of each script,  
in seconds
max_input_time = 60     ; Maximum amount of time each script may  
spend parsing request data
memory_limit = 50M      ; Maximum amount of memory a script may  
consume (8MB)


So we're having trouble downloading large attachments.  It works fine  
for 8 MB and under (though 8MB takes about a minute on a gigabit  
line) but 10MB and over seem to just hang after a minute and a half  
or so, only reporting a 200 Apache error in Safari.  Larger files  
just take longer to come back (ie ~15MB took 4 minutes) but they  
always give the same 200 code and no file downloaded.  In Firefox it  
does the same thing but the frame goes blank as well.  And in IE I  
get the typical (and ever so helpful) "page cannot be displayed"  
error after a couple of seconds.

Is there anything else I can try?